I haven't decided on a name for my Pokémon trainer yet.

He made Greninja leave, even resorting to venomous words in the process.

But Greninja knew its trainer so well that it wouldn't be swayed by such insincere words and stayed firmly by its trainer's side.

In the fierce battle, Greninja evolved into its strongest form and instantly defeated its opponent.

However, the two strongest players are present today, and the Grand Master has also evolved Charizard—based on Eevee's description and the content of the mural, it should undoubtedly be Mega Charizard X.

The two strongest at the time engaged in an earth-shattering battle, but Greninja ultimately prevailed, defeating Mega Charizard X and successfully escaping with its trainer.

However, in this vast world, there is no place for the beast tamer to hide. Bearing the charge of treason, he will be hunted down wherever he goes.

During a chase, the Beastmaster, Greninja, and Eevee stumbled into a secret realm that had accidentally opened a gap.

The beast tamer finally escaped the endless pursuit.

But the long escape also broke down the already battered body of the animal trainer.

Using the last peaceful moments in the secret realm, the beast tamer left behind all his life's learning and departed this world with endless regrets.

Greninja and Eevee worked together to bury the Beastmaster deep within these ruins.

Not many years later, Greninja, overwhelmed with grief, also passed away due to the recurrence of its old injuries.

From then on, with only one person and two Pokémon, Eevee was left to guard this place alone.

Many years later, Eevee was nearing the end of his life. With his last strength, he came to the depths of the ruins, intending to spend his final days there.

Unexpectedly, Eevee, who was supposed to die, suddenly discovered that its body had changed before it died. When it regained consciousness, it had become what it is now.

Having been reborn, Eevee begins to gather its followers in the secret realm, as it has a wish it wants to fulfill.

After taming most of the spirits in the secret realm, it ordered the spirits to carve on the walls of the ruins the content of its adventures with the Beastmaster and Greninja.

At that time, he was just a weak pet, so the painting only featured the tamer and Greninja, and Eevee was not present.

Time flies, and the newborn Eevee seems to have a long lifespan. It doesn't remember how much time it has lived until Ning Xian's accidental arrival.

Because the Beast Tamers were persecuted to death by humans, Eevee harbors considerable hatred towards humans. Although it knows that those people may no longer be around, it still orders its minions to launch an attack.

What followed was the series of events described above.